| abstract |
A security laminate comprising at least one biaxially oriented polyester lamella and an adhesion system associated therewith and on at least one side thereof, said adhesion system comprising a layer system comprising a polyester, a polyester-urethane or a copolymer of a chlorinated ethylene, said layer system being contiguous with said at least one biaxially oriented polyester lamella, wherein at least that part of said layer system contiguous with said polyester lamella was contiguous with said polyester lamella during at least part of the biaxial orientation of said at least one polyester lamella and wherein said layer system has a thickness of at least 1.0 μm; an adhesion system contiguous with a biaxially oriented polyester sheet, said adhesion system comprising a layer system comprising a polyester, a polyester-urethane or a copolymer of a chlorinated ethylene, said layer system being contiguous with said biaxially oriented polyester sheet, wherein at least that part of said layer system contiguous with said polyester lamella has been stretched during at least part of the biaxial orientation of said polyester sheet and wherein said layer system has a thickness of at least 1.0 μm; and a process for providing an adhesion system on at least one side of a biaxially oriented polyester sheet, said adhesion system comprising a layer system having a thickness of at least 1.0 μm contiguous therewith, said process comprising the steps of : biaxially stretching a polyester sheet with at least that part of said adhesion system contiguous with said polyester sheet being contiguous therewith during at least part of the biaxial stretching process, said part of said adhesion system contiguous with said polyester sheet being a layer having a composition comprising a polyester, a polyester-urethane or a copolymer of a chlorinated ethylene; and optionally applying a coating to said layer using conventional coating techniques, said layer and said optional coating being comprised in said layer system. |